Module: GraphQL::Client::Schema::ObjectType

Defined in:
lib/graphql/client/schema/object_type.rb

Constant Summary collapse

PREDICATE_CACHE =
Hash.new { |h, name|
  h[name] = -> { @data[name] ? true : false }
}
METHOD_CACHE =
Hash.new { |h, key|
  h[key] = -> {
    name = key.to_s
    type = self.class::FIELDS[key]
    @casted_data.fetch(name) do
      @casted_data[name] = type.cast(@data[name], @errors.filter_by_path(name))
    end
  }
}
MODULE_CACHE =
Hash.new do |h, fields|
  h[fields] = Module.new do
    fields.each do |name|
      GraphQL::Client::Schema::ObjectType.define_cached_field(name, self)
    end
  end
end
FIELDS_CACHE =
Hash.new { |h, k| h[k] = k }

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.define_cached_field(name, ctx) ⇒ Object


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# File 'lib/graphql/client/schema/object_type.rb', line 92

def self.define_cached_field(name, ctx)
  key = name
  name = -name.to_s
  method_name = ActiveSupport::Inflector.underscore(name)

  ctx.send(:define_method, method_name, &METHOD_CACHE[key])
  ctx.send(:define_method, "#{method_name}?", &PREDICATE_CACHE[name])
end

.new(type, fields = {}) ⇒ Object


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# File 'lib/graphql/client/schema/object_type.rb', line 12

def self.new(type, fields = {})
  Class.new(ObjectClass) do
    extend BaseType
    extend ObjectType

    define_singleton_method(:type) { type }
    define_singleton_method(:fields) { fields }
  end
end

Instance Method Details

#cast(value, errors) ⇒ Object


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# File 'lib/graphql/client/schema/object_type.rb', line 116

def cast(value, errors)
  case value
  when Hash
    new(value, errors)
  when NilClass
    nil
  else
    raise InvariantError, "expected value to be a Hash, but was #{value.class}"
  end
end

#define_class(definition, ast_nodes) ⇒ Object


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# File 'lib/graphql/client/schema/object_type.rb', line 22

def define_class(definition, ast_nodes)
  # First, gather all the ast nodes representing a certain selection, by name.
  # We gather AST nodes into arrays so that multiple selections can be grouped, for example:
  #
  #   {
  #     f1 { a b }
  #     f1 { b c }
  #   }
  #
  # should be treated like `f1 { a b c }`
  field_nodes = {}
  ast_nodes.each do |ast_node|
    ast_node.selections.each do |selected_ast_node|
      gather_selections(field_nodes, definition, selected_ast_node)
    end
  end

  # After gathering all the nodes by name, prepare to create methods and classes for them.
  field_classes = {}
  field_nodes.each do |result_name, field_ast_nodes|
    # `result_name` might be an alias, so make sure to get the proper name
    field_name = field_ast_nodes.first.name
    field_definition = definition.client.schema.get_field(type.name, field_name)
    field_return_type = field_definition.type
    field_classes[result_name.to_sym] = schema_module.define_class(definition, field_ast_nodes, field_return_type)
  end

  klass = Class.new(self)
  klass.define_fields(field_classes)
  klass.instance_variable_set(:@source_definition, definition)
  klass.instance_variable_set(:@_spreads, definition.indexes[:spreads][ast_nodes.first])

  if definition.client.enforce_collocated_callers
    keys = field_classes.keys.map { |key| ActiveSupport::Inflector.underscore(key) }
    Client.enforce_collocated_callers(klass, keys, definition.source_location[0])
  end

  klass
end

#define_field(name, type) ⇒ Object


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# File 'lib/graphql/client/schema/object_type.rb', line 101

def define_field(name, type)
  name = name.to_s
  method_name = ActiveSupport::Inflector.underscore(name)

  define_method(method_name) do
    @casted_data.fetch(name) do
      @casted_data[name] = type.cast(@data[name], @errors.filter_by_path(name))
    end
  end

  define_method("#{method_name}?") do
    @data[name] ? true : false
  end
end

#define_fields(fields) ⇒ Object


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# File 'lib/graphql/client/schema/object_type.rb', line 86

def define_fields(fields)
  const_set :FIELDS, FIELDS_CACHE[fields]
  mod = MODULE_CACHE[fields.keys.sort]
  include mod
end